A kind of superstretch magnetic response self-healing hydrogel and preparation method and application thereof
A self-healing, hydrogel technology, applied in the field of super-stretching, magnetic response self-healing polyurethane hydrogel and its preparation, can solve the problem of increasing the maintenance cost of soft robots, limiting the practical application of soft materials, and the mechanical properties of magnetic hydrogels. It can achieve good self-healing performance, solve the burden of frequent material replacement, and have universal effects
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[0043] A second aspect of the present invention provides a method for preparing an aldehyde group-terminated side chain pyridyl-containing polyurethane, the method comprising:
[0044](1) Dissolving a certain amount of diisocyanate, polyethylene glycol, dihydroxypyridine compound (PyDH) and a catalyst in an organic solvent, stirring, and reacting at a constant temperature to obtain an isocyanate-terminated polyurethane prepolymer solution.
[0045] (2) adding ethylenediamine to the reaction solution in step (1) under vigorous stirring, continuing to stir until the reaction is completed, and finally adding a glyoxal compound to react to obtain an aldehyde group-terminated pyridyl polyurethane (APy-PU), and Purify.
[0046] In some embodiments, the diisocyanates described in the above step (1) are aliphatic diisocyanates and aromatic diisocyanates, more preferably aliphatic diisocyanates, isophorone diisocyanates, toluene diisocyanates, diphenyl diisocyanates Methane diisocyana...
Embodiment 1
[0076] Preparation of polyurethane: 3.03 g of hexamethylene diisocyanate, 80.00 g of polyethylene glycol (with a number average molecular weight of 8000 g / mol), 1.07 g of dihydroxypyridine (PyDH) and 0.5 g of stannous isooctoate were dissolved in 100 mL of N, N-dimethylformamide (DMF) was added to the three-necked flask, and the oil bath was heated to 70 °C for constant temperature reaction, and the -NCO content in the system was determined by the di-n-butylamine method to reach the theoretical value, about 2.5h. After cooling to room temperature, 0.36 g of ethylenediamine was added dropwise with stirring, and the temperature was maintained at 23 °C until the -NCO absorption peak in the FT-IR spectrum disappeared, about 4 h. Continue to drop another 0.35 g of glyoxal into the reaction flask, and the temperature is raised to 30° C. for constant temperature reaction for 3.5 h. After the reaction was completed, it was cooled to room temperature, and a certain amount of DMF was ad...
Embodiment 2
[0079] Preparation of polyurethane: 3.03 g of hexamethylene diisocyanate, 72.00 g of polyethylene glycol (number average molecular weight of 8000 g / mol), 1.28 g of dihydroxypyridine (PyDH) and 0.6 g of stannous isooctoate were dissolved in 100 mL of N, N-dimethylformamide (DMF) was added into the three-necked flask, and the oil bath was heated to 75°C for constant temperature reaction, and the -NCO content in the system was determined by the di-n-butylamine method to reach the theoretical value, about 2h. After cooling to room temperature, 0.36 g of ethylenediamine was added dropwise with stirring, and the temperature was maintained at 20 °C until the -NCO absorption peak in the FT-IR spectrum disappeared, about 3.5 h. Continue to drop another 0.35 g of glyoxal into the reaction flask, and the temperature is raised to 40° C. for constant temperature reaction for 3.5 h. After the reaction was completed, it was cooled to room temperature, and a certain amount of DMF was added to...
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